Under The Dome will return with season 3 on 25 June on CBS.
The two-hour premiere episode is titled Move On, which will pick up from the events as shown in the season 2 finale.
According to reports, the "confusing" plot will be pieced together when the sci-fi series returns.
Executive producers of the show Neal Baer and Tim Schlattmann have stated that fans will learn the purpose of the mysterious and menacing dome in the upcoming season.
"We will tell you why the dome came down and what it's about," Baer promised at a CBS summer press event. "By the end of the season, you'll know exactly why this happened the way that it happened."
Season 2 showcased numerous twists all along, most notably of them was the all-powerful egg and its connection with Melanie Cross. But Schlattmann promised that all the loose ends will be addressed, if not completely tied up, by the end of the upcoming season.
"Why was there 25 years to pass before the dome came down? What was in play 25 years ago that set all this in motion? That's one of the biggies we're going to address," he confirmed.
"You'll see how these puzzle pieces form a puzzle that may be different from what you thought it would be," he added.
The show is based on Stephen King's best-selling novel about a small town that was suddenly sealed off from the world. It was last summer's number one programme, with more than 11 million viewers.
Emmy award-winning actress Marg Helgenberger stars as Christine Price, a therapist sent to help the town of Chester's Mill deal with the aftermath of the dome.
Helgenberger told CBS News that her character is there to help everybody out. "I'm hoping to make this a collective or a 'kinship' as my character refers it by going a long to get along and people need to kind of leave their individuality behind which doesn't go well with everyone in the community," she said.
"She's [Price] a new resident of Chester's Mill, and yet [she's] been there this whole time," Baer said. "That's the driving engine of this season: How is that even possible?"
Baer continued, "We've taken the viewers through all kinds of calamities. But now, it's really character-oriented. We promise you we will answer why the dome is there, but of course we're going to ask more questions."
In a latest trailer, fans can see that the villainous Big Jim (Dean Norris) is alive and arguing once again with Julia (Rachelle Lefevre) on how to save the residents of Chester's Mill, even though they were the ones left behind when season 2 concluded.
"Everyone in this town is trapped under the dome," Julia said to the former sheriff. But it looks like Big Jim has no desire to go toe-to-toe with the dangerous dome.
"The dome is here to destroy us," he fires back.